Analogy — Degree/intensity progression: Walking : Running :: Smiling : ____

Introduction / Context:
Running is a more intense/faster form of locomotion than walking; laughing is a more intense/expressive form of positive affect than smiling. The analogy is “mild → stronger”.

Why Other Options Are Wrong:

• Feeling/Face — categories, not intensity progressions.
• Weeping — opposite affect (sadness).

Final Answer:
Laughing